We report a case of ammonium acid urate uraturia in diabetic ketoacidosis, not before reported. A 39-year-old woman diagnosed with and treated for type 1 diabetes since 2000 had decided to discontinue insulin, making her glycemic control poor. Developing general fatigue and vomiting on January 31, 2010, she reduced insulin as she liked, resting in bed while hydrated. Her primary care physician, visiting her at home on February 1, 2010, diagnosed her with diabetic ketoacidosis, then had her taken by ambulance to our hospital. On hospital day (HOD) 2 after admission, urinary sediment showed numerous ammonium acid urate crystals. Her condition, along with her abnormal initial tubular function markers, improved in a few days. Ammonium acid urate crystals form stones rapidly and reports of cases with postrenal acute renal failure due to stones have increased. Considering the crystal formation mechanism, the risk is high in diabetic ketoacidosis and detecting crystals in urinalysis appears meaningful.
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